I also had both MC275 Mk6 and Rogue ST-100 in my setup driving Tannoy Turnberry SE speakers. MC275 is nice but it is warm and lacks clarity. If you want a warm sounding easy sound, go for it. ST-100 on the other hand is a nice and proper neutral tube amp. It will not sound like SS but it will also not remind you constantly that it is tubey and rounded. If you notice, it is tube, if you don't it is nothing. Higher resolution and clarity than 275. It is one of those amps which will not sound out of place even in a $200k system.